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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-37 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = b e, ===> x=1n(y/b)/ a <br /> where: y=concentration inµg/L a=decay constant <br /> b=concentration at time(x) x=time(x)in days <br /> Methyl Tertiary Tertiary Butyl <br /> Butyl Ether Alcohol <br /> Constituent (MTBE) (TBA) <br /> Given <br /> WQO: Y 1,800 18,000 <br /> Constant b NA NA <br /> Constant a NA NA <br /> Starting date for current trend: NA NA <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 NA NA <br /> Estimated Date to Reach WQO: (x=ln(y/b)/ a) Below WQO Below WQO <br /> f MTBE —m—TBA —Depth to Groundwater <br /> 10,000 0 <br /> u <br /> 0 <br /> F <br /> 1,000 4 <br /> m <br /> 3 3 <br /> o 'd <br /> m <br /> v 100 — B o <br /> o ra <br /> V p, <br /> v <br /> Q <br /> 10 112 <br /> oS °q ,° titi titi <br /> tier FIGURE <br /> Date C-69 <br /> Shell Stockton Terminal <br /> 3515 Navy Drive NM-37- <br /> Stockton,California MTBE and TBA Concentrations <br /> CONESTOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />